MSP430F149 TimerA outputs pwm signal
Keywords：MSP430F149 TimerA
Reference address：MSP430F149 TimerA outputs pwm signal C program code
Note the corresponding relationship between the register settings and the PWM signal output pins: P1.2-TA1, TACCR1, TACCTL1; P1.3-TA2, TACCR2, TACCTL2.
#include
#define uint unsigned int
#define uchar unsigned char
void int_clk()
{
uchar i;
BCSCTL1 &= ~XT2OFF; //Turn on XT oscillator
BCSCTL2 |= SELM1+SELS; //MCLK is 8MHz, SMCLK is 8MHz
do
{
IFG1&=~OFIFG; //Clear oscillation error flag
for(i=0;i<100;i++)
_NOP(); //Delay waiting
}
while((IFG1&OFIFG)!=0); //If the flag is 1, continue to loop and wait
IFG1&=~OFIFG;
}
void int_pwm()
{
P1SEL |= BIT2 + BIT3 ; //Select p1.2-TA1, P1.3-TA2 as the second function of PWM output
P1DIR |= BIT2 + BIT3 ;
TACCR0 = 800; //PWM signal frequency 10KHZ
TACCR1 = 400; // Duty cycle 1:1
TACCTL1 = OUTMOD_7;
TACCR2 = 400 ;
TACCTL2 = OUTMOD_7;
TACTL |= TASSEL1 +ID1 + ID0 + MC0 ; //Select SMCLK increase mode
}
void main()
{
WDTCTL = WDTPW + WDTHOLD;
int_clk();
int_pwm();
while(1);
}
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